Sandal upper



FIG. 1 is a exploded perspective view of a sandal upper, showing my new design in use;

FIG. 2 is a perspective view of a sandal upper, fully assembled;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines illustrate environmental structure and form no part of the claimed design. 

The ornamental design for a sandal upper, as shown and described. 